EP1189434A2
Expired / Lapsed
EP
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Correction curve generating method, image processing method, image display unit and storage medium
Assignee: Seiko Epson Corp
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Filing: 2001-09-13
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Granted: —
•
Expires: 2021-09-13
Abstract
Abstract It is intended to provided an image processing method, an image display unit, and a storage medium, capable of effecting an appropriate color reproduction even under a change in brightness of external illumination. In an image display unit according to the present invention wherein a desired image processing is applied to inputted image data, an tone reproduction characteristic in a dark surround of the image display unit in a dark surround and an tone reproduction characteristic in an illuminated surround of the image display unit under illumination of a predetermined luminance value are measured by a measuring means and the tone reproduction characteristic in an illuminated surround is approximated to the tone reproduction characteristic in a dark surround in a desired input tone range by a characteristic approximating means. Further, on the basis of the approximated tone reproduction characteristic in an illuminated surround a correction curve is generated by a correction curve generating means and an image processing is performed for input image data on the basis of the generated correction curve. <IMAGE>
Inventors
- 👤 Masashi Kanai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:46
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/57; H04N5/58; H04N9/00; H04N9/12; H04N9/31; H04N9/3179; H04N9/3182; H04N9/3191; H04N9/3194; H04N9/64; H04N9/68
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
114 words
A method for generating a correction curve for correcting image data
inputted to an image display unit, comprising: a measuring step of measuring an tone reproduction characteristic in a
dark surround of said image display unit and an tone reproduction characteristic
in an illuminated surround of the image display unit under illumination of a
predetermined luminance value; a characteristic approximating step of approximating said tone
reproduction characteristic in an illuminated surround to said tone reproduction
characteristic in a dark surround in a desired input tone range of input image
data; and a correction curve generating step of generating a correction curve on the
basis of the approximated tone reproduction characteristic in an illuminated
surround.
Claim 2
Independent Claim
67 words
A method for performing an image processing for image data inputted to
an image display unit, using a correction curve based on an tone reproduction
characteristic in an illuminated surround of said image display unit under
illumination of a predetermined luminance value, said tone reproduction
characteristic in an illuminated surround having been approximated to an tone
reproduction characteristic in a dark surround of the image display unit.
Claim 3
Dependent Claim
19 words
The method according to claim 2, having a plurality of correction curves
obtained using different said predetermined luminance values.
Claim 4
Dependent Claim
23 words
The method according to claim 2 or 3, wherein said desired input tone
range comprises a middle tone range and the vicinity thereof.
Claim 5
Independent Claim
68 words
The method according to any one of claims 2 to 4, wherein said tone
reproduction characteristic in a dark surround and said tone reproduction
characteristic in an illuminated surround are normalized to a predetermined
luminance range, and in the desired input tone range of input image data the
normalized tone reproduction characteristic in an illuminated surround is
approximated to the normalized tone reproduction characteristic in a dark
surround.
Claim 6
Independent Claim
28 words
The method according to any one of claims 2 to 5, wherein a correction
curve is subjected to a rounding processing in a low or high tone region.
Claim 7
Dependent Claim
15 words
The method according to claim 6, wherein the degree of said rounding
processing is adjustable.
Claim 8
Independent Claim
18 words
The method according to any one of claims 2 to 7, wherein the degree of
approximation is adjustable.
Claim 9
Independent Claim
52 words
The method according to any one of claims 3 to 8, including a selection
step of selecting one of plural correction curves on the basis of a luminance value
of external illumination, and wherein the input image data is subjected to an
image processing on the basis of the selected correction curve.
Claim 10
Dependent Claim
23 words
The method according to claim 9, further including a step of inputting the
luminance value of external illumination used in said selection step.
Claim 11
Dependent Claim
23 words
The method according to claim 9, further including a step of measuring
the luminance value of external illumination used in said selection step.
Claim 12
Dependent Claim
65 words
An image display unit for performing an image processing for an inputted
image data, using a correction curve based on an tone reproduction characteristic
in an illuminated surround of said image display unit under illumination of a
predetermined luminance value, said tone reproduction characteristic in an
illuminated surround having been approximated to an tone reproduction
characteristic in a dark surround of the image display unit.
Claim 13
Dependent Claim
143 words
An image display unit for performing an image processing for an inputted
image data, wherein the image display unit performs the image processing for
the inputted data based on a correction curve, which is sequentially generated by
sequentially repeating a method for generating the correction curve comprising: a measuring step of measuring an tone reproduction characteristic in a
dark surround of said image display unit and an tone reproduction characteristic
in an illuminated surround of the image display unit under illumination of a
predetermined luminance value; a characteristic approximating step of approximating said tone
reproduction characteristic in an illuminated surround to said tone reproduction
characteristic in a dark surround in a desired input tone range of input image
data; and a correction curve generating step of generating a correction curve on the
basis of the approximated tone reproduction characteristic in an illuminated
surround.
Claim 14
Dependent Claim
21 words
The image display unit according to claim 12, having a plurality of
correction curves obtained using different said predetermined luminance values.
Claim 15
Dependent Claim
143 words
An image display unit for performing an image processing for an inputted
image data, comprising a storage means for storing a plurality of correction
curves, which are generated by repeating a method for generating the correction
curve, wherein a predetermined luminance value is changed each time,
comprising: a measuring step of measuring an tone reproduction characteristic in a
dark surround of said image display unit and an tone reproduction characteristic
in an illuminated surround of the image display unit under illumination of the
predetermined luminance value; a characteristic approximating step of approximating said tone
reproduction characteristic in an illuminated surround to said tone reproduction
characteristic in a dark surround in a desired input tone range of input image
data; and a correction curve generating step of generating a correction curve on the
basis of the approximated tone reproduction characteristic in an illuminated
surround.
Claim 16
Dependent Claim
28 words
The image display unit according to any one of claims 12 to 15, wherein
said desired input tone range comprises a middle tone range and the vicinity
thereof.
Claim 17
Dependent Claim
70 words
The image display unit according to any one of claims 12 to 16, wherein
said tone reproduction characteristic in a dark surround and said tone
reproduction characteristic in an illuminated surround are normalized to a
predetermined luminance range, and in the desired input tone range of input
image data the normalized tone reproduction characteristic in an illuminated
surround is approximated to the normalized tone reproduction characteristic in a
dark surround.
Claim 18
Dependent Claim
30 words
The image display unit according to any one of claims 12 to 17, wherein a
correction curve is subjected to a rounding processing in a low or high tone region.
Claim 19
Dependent Claim
17 words
The image display unit according to claim 18, wherein the degree of said
rounding processing is adjustable.
Claim 20
Dependent Claim
20 words
The image display unit according to any one of claims 12 to 19, wherein
the degree of approximation is adjustable.
Claim 21
Dependent Claim
54 words
The image display unit according to any one of claims 14 to 20, including
a selection means for selecting one of plural correction curves on the basis of a
luminance value of external illumination, and wherein the input image data is
subjected to an image processing on the basis of the selected correction curve.
Claim 22
Dependent Claim
25 words
The image display unit according to claim 21, further including a means
for inputting the luminance value of external illumination used in said selection
means.
Claim 23
Dependent Claim
25 words
The image display unit according to claim 21, further including a means
for measuring the luminance value of external illumination used in said selection
means.
Claim 24
Dependent Claim
78 words
A computer-readable medium having a program of instructions for
execution by the computer to perform an image processing for image data
inputted to an image display unit, using a correction curve based on an tone
reproduction characteristic in an illuminated surround of said image display unit
under illumination of a predetermined luminance value, said tone reproduction
characteristic in an illuminated surround having been approximated to an tone
reproduction characteristic in a dark surround of the image display unit.
Claim 25
Dependent Claim
20 words
The computer-readable medium according to claim 24, having a plurality
of correction curves obtained using different said predetermined luminance
values.
Claim 26
Dependent Claim
24 words
The computer-readable medium according to claim 24 or 25, wherein said
desired input tone range comprises a middle tone range and the vicinity thereof.
Claim 27
Dependent Claim
69 words
The computer-readable medium according to any one of claims 24 to 26,
wherein said tone reproduction characteristic in a dark surround and said tone
reproduction characteristic in an illuminated surround are normalized to a
predetermined luminance range, and in the desired input tone range of input
image data the normalized tone reproduction characteristic in an illuminated
surround is approximated to the normalized tone reproduction characteristic in a
dark surround.
Claim 28
Dependent Claim
29 words
The computer-readable medium according to any one of claims 24 to 27,
wherein a correction curve is subjected to a rounding processing in a low or high
tone region.
Claim 29
Dependent Claim
16 words
The computer-readable medium according to claim 28, wherein the
degree of said rounding processing is adjustable.
Claim 30
Dependent Claim
19 words
The computer-readable medium according to any one of claims 24 to 29,
wherein the degree of approximation is adjustable.
Claim 31
Dependent Claim
53 words
The computer-readable medium according to any one of claims 25 to 30,
including a selection processing of selecting one of plural correction curves on the
basis of a luminance value of external illumination, and wherein the input image
data is subjected to an image processing on the basis of the selected correction
curve.
Claim 32
Dependent Claim
24 words
The computer-readable medium according to claim 31, further including a
processing of inputting the luminance value of external illumination used in said
selection processing.
Claim 33
Dependent Claim
24 words
The computer-readable medium according to claim 31, further including a
processing of measuring the luminance value of external illumination used in
said selection processing.
Claim 34
Dependent Claim
73 words
A computer-readable medium storing a correction curve for performing an
image processing for image data inputted to an image display unit, wherein the
correction curve is based on an tone reproduction characteristic in an illuminated
surround of said image display unit under illumination of a predetermined
luminance value, said tone reproduction characteristic in an illuminated
surround having been approximated to an tone reproduction characteristic in a
dark surround of the image display unit.
Claim 35
Dependent Claim
20 words
The computer-readable medium according to claim 34, having a plurality
of correction curves obtained using different said predetermined luminance
values.
Claim 36
Dependent Claim
24 words
The computer-readable medium according to claim 34 or 35, wherein said
desired input tone range comprises a middle tone range and the vicinity thereof.
Claim 37
Dependent Claim
69 words
The computer-readable medium according to any one of claims 34 to 36,
wherein said tone reproduction characteristic in a dark surround and said tone
reproduction characteristic in an illuminated surround are normalized to a
predetermined luminance range, and in the desired input tone range of input
image data the normalized tone reproduction characteristic in an illuminated
surround is approximated to the normalized tone reproduction characteristic in a
dark surround.
Claim 38
Dependent Claim
29 words
The computer-readable medium according to any one of claims 34 to 37,
wherein a correction curve is subjected to a rounding processing in a low or high
tone region.
Claim 39
Dependent Claim
16 words
The computer-readable medium according to claim 38, wherein the
degree of said rounding processing is adjustable.
Claim 40
Dependent Claim
19 words
The computer-readable medium according to any one of claims 34 to 39,
wherein the degree of approximation is adjustable.
References Cited (Backward Citations)
JPH09149337A
Cited
GB2335326A
Cited
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